Mtx Jackhammer Series Jh1200 2,400 Watt Peak and 1,200 Watt True Rms @ 1 Ohm Mono Class Inch D Inch Car Amplifier with Fully Digital Circuitry and Amazing Sound Quality and Efficiency Mono subwoofer amplifier 400 watts RMS x 1 at 4 ohms (800 watts RMS x 1 at 2 ohms) 1,200 watts RMS x 1 at 1 ohm Frequency response: 20-200 Hz Variable low-pass filter (40-200 Hz, 24 dB/octave)